package com.view;

import java.util.Locale;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Typeface;
import android.os.Build;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.HorizontalScrollView;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.androidlibview.R;
import com.webkitlib.util.KLoger;

/**
 * 
 * Created by hanWG on 2015-10-10 下午1:57:19 $
 * 
 * @Description 滑动指示器
 *              <p/>
 *              滑动指示器 pstsIndicatorColor颜色 在视图的底部的全宽度的线pstsunderlineColor颜色
 *              选项卡之间的分隔pstsdDividercolor颜色 滑动指示器pstsIndicatorheightheight
 *              在视图的底部的全宽度的线pstsunderlineheight高度 pstsdividerpadding顶部和底部填充的分频器
 *              pststabpaddingleftright左、右填充每个选项卡 pstsscrollOffsets卷轴被选择的标签的偏移
 *              pststabbackground背景绘制的每个标签，应该是一个statelistdrawable
 *              pstsshouldexpand如果设置为TRUE，每个标签都给予同样的重量，默认为false
 *              pststextallcaps如果为真，所有选项卡标题都是大写，默认为true
 */
public class PagerSlidingTabStrip extends HorizontalScrollView {

	public interface IconTabProvider {
		public int getPageIconResId(int position);
	}

	// @formatter:off
	private static final int[] ATTRS = new int[] { android.R.attr.textSize,
			android.R.attr.textColor };
	// @formatter:on

	private LinearLayout.LayoutParams defaultTabLayoutParams;// 默认的布局
	private LinearLayout.LayoutParams expandedTabLayoutParams;// 扩大的布局

	private final PageListener pageListener = new PageListener();
	private ViewPager.OnPageChangeListener delegatePageListener;

	private LinearLayout tabsContainer;
	private ViewPager pager;

	private int tabCount;

	private int currentPositions = 0;
	private int selectedPositions = 0;
	private float currentPositionOffsets = 0f;

	private Paint rectPaints;
	private Paint dividerPaint;

	private int indicatorColor = 0xFF666666;
	private int underlineColor = 0x1A000000;
	private int dividerColor = 0x1A000000;

	private boolean shouldExpand = false;
	private boolean textAllCaps = true;

	private int scrollOffsets = 52;
	private int indicatorHeights = 8;
	private int underlineHeights = 2;
	private int dividerPaddings = 12;// 分割线的padding的距离
	private int tabPaddings = 14;// 默认24 每个tab的Padding的大小，当太大时候 tab多的时候会出现滑动的布局
	private int dividerWidth = 1;

	private int tabTextSize = 12;
	private int tabTextColors = 0xFF666666;
	private int selectedTabTextColor = 0xFF666666;
	private Typeface tabTypefaces = null;
	private int tabTypefacesStyles = Typeface.NORMAL;

	private int lastScrollXs = 0;

	private int tabBackgroundResId = R.drawable.background_tab;

	private Locale locales;

	public PagerSlidingTabStrip(Context context) {
		this(context, null);
	}

	public PagerSlidingTabStrip(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}

	public PagerSlidingTabStrip(Context context, AttributeSet attrs,
			int defStyle) {
		super(context, attrs, defStyle);
		setFillViewport(true);
		setWillNotDraw(false);
		tabsContainer = new LinearLayout(context);
		tabsContainer.setOrientation(LinearLayout.HORIZONTAL);
		tabsContainer.setLayoutParams(new LayoutParams(
				LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
		addView(tabsContainer);
		DisplayMetrics dm = getResources().getDisplayMetrics();
		// 自定义属性
		scrollOffsets = (int) TypedValue.applyDimension(
				TypedValue.COMPLEX_UNIT_DIP, scrollOffsets, dm);
		indicatorHeights = (int) TypedValue.applyDimension(
				TypedValue.COMPLEX_UNIT_DIP, indicatorHeights, dm);
		underlineHeights = (int) TypedValue.applyDimension(
				TypedValue.COMPLEX_UNIT_DIP, underlineHeights, dm);
		dividerPaddings = (int) TypedValue.applyDimension(
				TypedValue.COMPLEX_UNIT_DIP, dividerPaddings, dm);
		tabPaddings = (int) TypedValue.applyDimension(
				TypedValue.COMPLEX_UNIT_DIP, tabPaddings, dm);
		dividerWidth = (int) TypedValue.applyDimension(
				TypedValue.COMPLEX_UNIT_DIP, dividerWidth, dm);
		tabTextSize = (int) TypedValue.applyDimension(
				TypedValue.COMPLEX_UNIT_SP, tabTextSize, dm);
		TypedArray a = context.obtainStyledAttributes(attrs, ATTRS);
		tabTextSize = a.getDimensionPixelSize(0, tabTextSize);
		tabTextColors = a.getColor(1, tabTextColors);
		a.recycle();
		a = context.obtainStyledAttributes(attrs,
				R.styleable.PagerSlidingTabStrip);
		indicatorColor = a.getColor(
				R.styleable.PagerSlidingTabStrip_pstsIndicatorColor,
				indicatorColor);
		selectedTabTextColor = a.getColor(
				R.styleable.PagerSlidingTabStrip_selectedTabTextColor,
				indicatorColor);
		underlineColor = a.getColor(
				R.styleable.PagerSlidingTabStrip_pstsUnderlineColor,
				underlineColor);
		dividerColor = a
				.getColor(R.styleable.PagerSlidingTabStrip_pstsDividerColor,
						dividerColor);
		indicatorHeights = a.getDimensionPixelSize(
				R.styleable.PagerSlidingTabStrip_pstsIndicatorHeight,
				indicatorHeights);
		underlineHeights = a.getDimensionPixelSize(
				R.styleable.PagerSlidingTabStrip_pstsUnderlineHeight,
				underlineHeights);
		dividerPaddings = a.getDimensionPixelSize(
				R.styleable.PagerSlidingTabStrip_pstsDividerPadding,
				dividerPaddings);
		tabPaddings = a.getDimensionPixelSize(
				R.styleable.PagerSlidingTabStrip_pstsTabPaddingLeftRight,
				tabPaddings);
		tabBackgroundResId = a.getResourceId(
				R.styleable.PagerSlidingTabStrip_pstsTabBackground,
				tabBackgroundResId);
		shouldExpand = a
				.getBoolean(R.styleable.PagerSlidingTabStrip_pstsShouldExpand,
						shouldExpand);
		scrollOffsets = a.getDimensionPixelSize(
				R.styleable.PagerSlidingTabStrip_pstsScrollOffset,
				scrollOffsets);
		textAllCaps = a.getBoolean(
				R.styleable.PagerSlidingTabStrip_pstsTextAllCaps, textAllCaps);

		a.recycle();

		rectPaints = new Paint();
		rectPaints.setAntiAlias(true);
		rectPaints.setStyle(Style.FILL);
		dividerPaint = new Paint();
		dividerPaint.setAntiAlias(true);
		dividerPaint.setStrokeWidth(dividerWidth);
		defaultTabLayoutParams = new LinearLayout.LayoutParams(
				LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
		expandedTabLayoutParams = new LinearLayout.LayoutParams(0,
				LayoutParams.MATCH_PARENT, 1.0f);

		if (locales == null) {
			locales = getResources().getConfiguration().locale;
		}
	}

	public void setViewPager(ViewPager pager) {
		this.pager = pager;
		if (pager.getAdapter() == null) {
			throw new IllegalStateException(
					"ViewPager does not have adapter instance.");
		}
		pager.addOnPageChangeListener(pageListener);
		notifyDataSetChanged();
	}

	public void setOnPageChangeListener(OnPageChangeListener listener) {
		this.delegatePageListener = listener;
	}

	public void notifyDataSetChanged() {
		tabsContainer.removeAllViews();
		tabCount = pager.getAdapter().getCount();
		for (int i = 0; i < tabCount; i++) {
			if (pager.getAdapter() instanceof IconTabProvider) {
				addIconTab(i,
						((IconTabProvider) pager.getAdapter())
								.getPageIconResId(i));
			} else {
				addTextTab(i, pager.getAdapter().getPageTitle(i).toString());
			}

		}

		updateTabStyles();

		getViewTreeObserver().addOnGlobalLayoutListener(
				new OnGlobalLayoutListener() {

					@SuppressWarnings("deprecation")
					@Override
					public void onGlobalLayout() {
						getViewTreeObserver()
								.removeGlobalOnLayoutListener(this);
						currentPositions = pager.getCurrentItem();
						scrollToChild(currentPositions, 0);
					}
				});

	}

	private void addTextTab(final int position, String title) {
		TextView tab = new TextView(getContext());
		tab.setText(title);
		tab.setGravity(Gravity.CENTER);
		tab.setSingleLine();
		addTab(position, tab);
	}

	private void addIconTab(final int position, int resId) {
		ImageButton tab = new ImageButton(getContext());
		tab.setImageResource(resId);
		addTab(position, tab);
	}

	private void addTab(final int position, View tab) {
		tab.setFocusable(true);
		tab.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				pager.setCurrentItem(position);
			}
		});
		tab.setPadding(tabPaddings, 0, tabPaddings, 0);
		tabsContainer
				.addView(tab, position, shouldExpand ? expandedTabLayoutParams
						: defaultTabLayoutParams);
	}

	/**
	 * 更新tab的属性，切换到当前的tab 时候
	 */
	private void updateTabStyles() {
		KLoger.d("==page监听==", "aa");
		for (int i = 0; i < tabCount; i++) {
			View v = tabsContainer.getChildAt(i);
			v.setBackgroundResource(tabBackgroundResId);
			if (v instanceof TextView) {
				TextView tab = (TextView) v;
				tab.setTextSize(TypedValue.COMPLEX_UNIT_PX, tabTextSize);
				tab.setTypeface(tabTypefaces, tabTypefacesStyles);
				tab.setTextColor(tabTextColors);
				if (textAllCaps) {
					if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
						tab.setAllCaps(true);
					} else {
						tab.setText(tab.getText().toString()
								.toUpperCase(locales));
					}
				}
				if (i == selectedPositions) {
					tab.setTextColor(selectedTabTextColor);
					TextPaint tp = tab.getPaint();
					tp.setFakeBoldText(true);
				}
			}
		}

	}

	private void scrollToChild(int position, int offset) {
		if (tabCount == 0) {
			return;
		}
		int newScrollX = tabsContainer.getChildAt(position).getLeft() + offset;
		if (position > 0 || offset > 0) {
			newScrollX -= scrollOffsets;
		}
		if (newScrollX != lastScrollXs) {
			lastScrollXs = newScrollX;
			scrollTo(newScrollX, 0);
		}
	}

	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);

		if (isInEditMode() || tabCount == 0) {
			return;
		}

		final int height = getHeight();

		// draw underline
		rectPaints.setColor(underlineColor);
		canvas.drawRect(0, height - underlineHeights, tabsContainer.getWidth(),
				height, rectPaints);

		// draw indicator line
		rectPaints.setColor(indicatorColor);

		// default: line below current tab
		View currentTab = tabsContainer.getChildAt(currentPositions);
		float lineLeft = currentTab.getLeft();
		float lineRight = currentTab.getRight();

		// if there is an offset, start interpolating left and right coordinates
		// between current and next tab
		if (currentPositionOffsets > 0f && currentPositions < tabCount - 1) {

			View nextTab = tabsContainer.getChildAt(currentPositions + 1);
			final float nextTabLeft = nextTab.getLeft();
			final float nextTabRight = nextTab.getRight();

			lineLeft = (currentPositionOffsets * nextTabLeft + (1f - currentPositionOffsets)
					* lineLeft);
			lineRight = (currentPositionOffsets * nextTabRight + (1f - currentPositionOffsets)
					* lineRight);
		}

		canvas.drawRect(lineLeft, height - indicatorHeights, lineRight, height,
				rectPaints);

		// draw divider

		dividerPaint.setColor(dividerColor);
		for (int i = 0; i < tabCount - 1; i++) {
			View tab = tabsContainer.getChildAt(i);
			canvas.drawLine(tab.getRight(), dividerPaddings, tab.getRight(),
					height - dividerPaddings, dividerPaint);
		}
	}

	/** page的滑动监听 */
	private class PageListener implements OnPageChangeListener {
		@Override
		public void onPageScrolled(int position, float positionOffset,
				int positionOffsetPixels) {
			currentPositions = position;
			currentPositionOffsets = positionOffset;
			scrollToChild(position, (int) (positionOffset * tabsContainer
					.getChildAt(position).getWidth()));
			invalidate();
			if (delegatePageListener != null) {
				delegatePageListener.onPageScrolled(position, positionOffset,
						positionOffsetPixels);
			}
		}

		@Override
		public void onPageScrollStateChanged(int state) {
			if (state == ViewPager.SCROLL_STATE_IDLE) {
				scrollToChild(pager.getCurrentItem(), 0);
			}

			if (delegatePageListener != null) {
				delegatePageListener.onPageScrollStateChanged(state);
			}
		}

		@Override
		public void onPageSelected(int position) {
			selectedPositions = position;
			updateTabStyles();
			if (delegatePageListener != null) {
				delegatePageListener.onPageSelected(position);
			}
		}

	}

	public void setIndicatorColor(int indicatorColor) {
		this.indicatorColor = indicatorColor;

		invalidate();
	}

	public void setIndicatorColorResource(int resId) {
		this.indicatorColor = getResources().getColor(resId);

		invalidate();
	}

	public int getIndicatorColor() {
		return this.indicatorColor;
	}

	public void setIndicatorHeight(int indicatorLineHeightPx) {
		this.indicatorHeights = indicatorLineHeightPx;
		invalidate();
	}

	public int getIndicatorHeight() {
		return indicatorHeights;
	}

	public void setUnderlineColor(int underlineColor) {
		this.underlineColor = underlineColor;
		invalidate();
	}

	public void setUnderlineColorResource(int resId) {
		this.underlineColor = getResources().getColor(resId);
		invalidate();
	}

	public int getUnderlineColor() {
		return underlineColor;
	}

	public void setDividerColor(int dividerColor) {
		this.dividerColor = dividerColor;
		invalidate();
	}

	public void setDividerColorResource(int resId) {
		this.dividerColor = getResources().getColor(resId);
		invalidate();
	}

	public int getDividerColor() {
		return dividerColor;
	}

	public void setUnderlineHeight(int underlineHeightsPx) {
		this.underlineHeights = underlineHeightsPx;
		invalidate();
	}

	public int getUnderlineHeight() {
		return underlineHeights;
	}

	public void setDividerPadding(int dividerPaddingsPx) {
		this.dividerPaddings = dividerPaddingsPx;
		invalidate();
	}

	public int getDividerPadding() {
		return dividerPaddings;
	}

	public void setscrollOffsets(int scrollOffsetsPx) {
		this.scrollOffsets = scrollOffsetsPx;
		invalidate();
	}

	public int getscrollOffsets() {
		return scrollOffsets;
	}

	public void setShouldExpand(boolean shouldExpand) {
		this.shouldExpand = shouldExpand;
		notifyDataSetChanged();
	}

	public boolean getShouldExpand() {
		return shouldExpand;
	}

	public boolean isTextAllCaps() {
		return textAllCaps;
	}

	public void setAllCaps(boolean textAllCaps) {
		this.textAllCaps = textAllCaps;
	}

	public void setTextSize(int textSizePx) {
		this.tabTextSize = textSizePx;
		updateTabStyles();
	}

	public int getTextSize() {
		return tabTextSize;
	}

	public void setTextColor(int textColor) {
		this.tabTextColors = textColor;
		updateTabStyles();
	}

	public void setTextColorResource(int resId) {
		this.tabTextColors = getResources().getColor(resId);
		updateTabStyles();
	}

	public int getTextColor() {
		return tabTextColors;
	}

	public void setSelectedTextColor(int textColor) {
		this.selectedTabTextColor = textColor;
		updateTabStyles();
	}

	public void setSelectedTextColorResource(int resId) {
		this.selectedTabTextColor = getResources().getColor(resId);
		updateTabStyles();
	}

	public int getSelectedTextColor() {
		return selectedTabTextColor;
	}

	public void setTypeface(Typeface typeface, int style) {
		this.tabTypefaces = typeface;
		this.tabTypefacesStyles = style;
		updateTabStyles();
	}

	public void setTabBackground(int resId) {
		this.tabBackgroundResId = resId;
		updateTabStyles();
	}

	public int getTabBackground() {
		return tabBackgroundResId;
	}

	public void setTabPaddingLeftRight(int paddingPx) {
		this.tabPaddings = paddingPx;
		updateTabStyles();
	}

	public int getTabPaddingLeftRight() {
		return tabPaddings;
	}

	@Override
	public void onRestoreInstanceState(Parcelable state) {
		SavedState savedState = (SavedState) state;
		super.onRestoreInstanceState(savedState.getSuperState());
		currentPositions = savedState.currentPosition;
		requestLayout();
	}

	@Override
	public Parcelable onSaveInstanceState() {
		Parcelable superState = super.onSaveInstanceState();
		SavedState savedState = new SavedState(superState);
		savedState.currentPosition = currentPositions;
		return savedState;
	}

	static class SavedState extends BaseSavedState {
		int currentPosition;

		public SavedState(Parcelable superState) {
			super(superState);
		}

		private SavedState(Parcel in) {
			super(in);
			currentPosition = in.readInt();
		}

		@Override
		public void writeToParcel(Parcel dest, int flags) {
			super.writeToParcel(dest, flags);
			dest.writeInt(currentPosition);
		}

		public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {
			@Override
			public SavedState createFromParcel(Parcel in) {
				return new SavedState(in);
			}

			@Override
			public SavedState[] newArray(int size) {
				return new SavedState[size];
			}
		};
	}

}
